Stroke-regulating device for pull rods



Jan. 3, 1933. J. R. MAI-IAN STROKE REGULATING DEVICE FOR PULL RDS Filed March 4, 1952 Patented Jan. 3, 1933 i UNITED STATES PATENT OFFICE JOSEPH B. MEAN, OF TOLEDO, OHIO, ASSIGNOR TO THE NATIONAL SUPPLY COMPANY, F TOLEDO,OHIO, .A CORPORATION' 0F OHIO STROKE-REGULATING DEVIGE FOR PULL RODS Application led March 4,

This invention relates to improvements in stroke-regulating devices for pull rods designed to form connections between anumber of pumping jacks and a central operatin device known as a pumping power.

t is the principal object o f this invention to provide means for regulating the length of the stroke transmitted from the `pumping power to a. pumping jack and also to `provide means for holding the pull rod stationary without it being necessary to make a disconnection in the pull rod. Other objects will appear hereinafter.

Referring to the accompanying drawing, Fig. 1 is a plan view illustrating one form of my invention, portions being omitted and broken away; Fig. 2, an end elevation of Fig. 1, the pumping power being omitted; Fig. 3, a section on the line 3-3 on Fig. 2; Fig. 4, an elevation showing a side elevation of the pawl 23 and the means by which it is supported and locked in inoperative position; and Fig. 5, an end elevation of Fig. 4 with a portion ofthe wheel 17 shown in section.

On the drawing, l denotes the driven shaft of a pumping power. A cam 2 is keyed tothe shaft and rotates in the strap or collar 3. 4 designates the power connection which comprises the cable 5 having one end secured to the clamp 6 carried by the collar, 3, the

clamp member 7 in which the other end ofthe cable 5 is secured, the U-shaped member-or clevis 8 also secured in the clamp 7, and the loop 9 interlinkedwith the clevis 8 and -receiving one end of the oscillatory member or arm 10. The collar 3 is provided with a number of clamp members 6 Vto which other power connectors may be connected 1n a well known manner.,l

The arm 10 has two horizontal channe bars 11 with their channels facing each other. The ends of the bars are spaced apart by the spacers 12. The shaft 13 has it ends journaled in the spacers 12 and 1s providedv with the central threaded portion 14 which works inthe traveling block 15 having its upper and lower ends guided inthe channels in the bars 11 as shown in Fig 3.

The shaft 13 is provided with the beveled gear16 meshing with the beveled gear 17 1932. Serial No. 596,722.

loosely mounted on the stub shaft 18 carried by the upper face of the upper bar 11 near one end thereof. 19 is a stub shaft secured to the lower face of the lower bar 11 so that the axial centers of the shafts 18 and 19 are in vertical alinement. The shaft 19 is mounted for oscillation in the vertical bearing 20 in the foundation 21. The shafts 18 and 19 are carried by the end of the arm 10 opposite that which carries the loop 9.

An arm 22 is iixedly mounted on the post 31 by any suitable means. The outer end of the arm 22 carries the gravity pawl 23 adapted to be swung into interlocking en: gagement with the teeth 24 on the upper face of the gear 17. The pawl may be swung so as to engage teeth at either side of the arm 22. 25 is a member carried by the upper side of the arm 22 and is adapted to spring into the space between the lugs 26 on the side of the pawl when the latter is swung up to the vertical position as shown in Fig. 5 so that the pawl is held out of engagement with the teeth 24.

The traveling block 15 is provided with the neck 27 which receives an opening in the connector plate 28 to which the pull rod connection 29 is attached. It is well understood that the pull rod connection 29 is adapted to be connected to a pumping jack, whose operation in connection with pull rods is well understood.

With the plate 28 at the left hand dotted position on Fig. 1, the rotation of the shaft 1 will cause the oscillation of the arm 10 on its shaft 19 and the pull rod connection 29 will then have its longest possible stroke. Each time the arm 10 is moved toward the shaft 1 the pull rod connection 29 will operate a pump in a well known manner, the pull rod which includes the power connection 4, the arm 10 and the pull rod connection 29 returning to its initial position by the gravity of the pumping mechanism at the well as is well understood by those acquainted with the art to which thisv invention be-A longs. When the pawl 23 is locked in its upper position as shown in Fig. 5, the oscillations of the arm 10 cannot transmit rotary motion to the gear 16 through the gear 17, as

the gear 17 is free to oscillate with the arm 10 on the stub shaft 18. Accordingly, the plate 28 will remain in its left hand position until the pawl 23 is brought into engagement with the teeth 24 on that side of the arm 22 which will cause the shaft 13 to rotate so as to move the plate 28 toward the right. The plate 28 can be driven by the connection just recited so as to cause the pull rod connection 29 to have the desired length of stroke. The

oscillation of the arm 10 through the shaft 13 and the gear 16 causes the oscillation of the gear 17' which causes the pawl 23 when in engagement withothe teeth 24 to make the gear 17 a rigid member, thereby causing the gear 16 to be rotated in one direction when the arm 10 travels in the same direction. When the arm 10 travels in the opposite direction the pawl 23 rides idly over the teeth 24. In case it is desired to have the pull rod connection 29 remain idle while the arm 10 continues to oscillate, the plate 28 will be moved to the right under the action of the pawl 23 to the dotted position shown at the right hand end of, Fig. 1 where the plate 28 is moved centrally between the shafts 18 and 19. The plate 28 may be moved to the left by throwing the pawl 23 to the opposite side of the arm 22, whereupon the shaft 13 will be rotated in the reverse direction causing the plate 28 to travel toward the left.

The threaded portion 14 of the shaft 13 is provided with a-blank portion. 30 at each end so that the plate 28 cannot b e fed too far in either direction. As soon as the plate 28 is fed from the threaded portion 14 onto a blank portion 30, the feed of the plate 28 stops and prevents any possibility of damage to the apparatus.

I claim 1. In a stroke-regulating device for pull rods, a power connection, a pull rod connection, a lever, devices for attaching one end of each connection t0 the lever, and means actuated by the movements of the lever for adjusting one of the devices longitudinally of the lever.

2. In a stroke-regulating device for pull rods, a source of reciprocating motion, a lever, a power connection attached to .the source and the lever, a pull rod connection attachedtto the lever, and means actuated by the movements of the lever for adjusting the attachment of one of the connections longitudinally of the lever whereby the stroke of the pull rod connection may be varied.

3. In a stroke-regulating device for pull rods, a source of reciprocating motion, a lever, a power connection attached to the source and the lever, a pull rod connection attached to the lever, and means automatically operated by the lever for adjusting the attachment of one of the connections longitudinally of the lever whereby the stroke of the pull rod connection may be varied.

4. In a stroke-regulating device for pull rods, a source of reciprocating motion, a lever, a power connection attached'to the source and the lever, a pull rod connection attached tothe lever, and means actuated by the movements of the Jlever for adjusting the attachment of the pull rod connection longitudinally of the lever whereby the stroke of the pull rod connection may be varied.

5. In a stroke-regulating device for pull rods, a source of reciprocating motion, a lever, a power connection attached to the source and the lever, a pull rod connection attached to the lever, means including a screw carried by the lever for adjusting the attachment of the pull rod connection longitudinally of the lever whereby the stroke of the pull rod connection may be varied, and means whereby the movements of thelever rotate the screw to effect the said adjustment. j c

6. In a stroke-regulating device for pull rods, a lever, a rotatable screw carried thereby, a gear carried by the screw for rotating the same, astub shaft carried by the lever, a gear loose on the stub shaft and meshing with the first gear and having ratchet teeth thereon, a fixed support, a pawl carried by the support and engageable with the teeth to hold the second gear from rotation when the lever moves in one direction only, a power connection for oscillating the lever, a block operable by the screw, and a pull rod Connection attached to the block.'

7. In a stroke-regulating device for pull rods, a lever, a rotatable screw carried thereby, gearing carried by the screw for rotating the same, a shaft carried by the lever and oscillable with the oscillations of the lever, a fixed support, a pawl carried by the support and engageable with the gearing to drive the latter when the lever moves in one direction only, a power connection for oscillating the lever, a block operable by the screw, and a pull rod connection attached to the block, the pawl being reversible whereby it may drive the gearing in either direction and thereby cause the block to vary its distance in either direction from the center of oscillation of the lever.

8. In a stroke-regulating device for pull 'rods, a lever, a rotatable screw carried thereby, gearing carried by the screw for rotating the saine, a shaft carried by the lever and oscillable with the oscillations of the lever, a;

xed support, a pawl driven by the shaft and engageable with the gearing to drive the lat-v ter when the lever moves in one direction only, a power connection for oscillating the lever, a block operable by the screw, a pull rod connection attached to the block, and means for preventing the pawl from engagin the gearing. l l

n testimony whereof, I hereunto aflix my signature.

JOSEPH R. MAHAN. 

